That's very interesting. I can't see how the mag mount could change the
pattern shape any, so your experience indicates a severe loss in the
coupling capacitor, maybe as high as 90% or more. That's hard to
imagine, so I wonder if anyone else has had a similar experience -- or,
much better yet, actual measurements.

Roy Lewallen, W7EL

wrote:
By how much? Why?


I would assume the direct connection with the roof
metal. I tried this one time, after trashing a larson
magmount with about 84 knocks off the car...
When I converted it over to a hole mount, with the
usual NMO, there was a good bit of difference. I didn't
measure, as the mag mount was toast, but it was quite
large actually. Like maybe a change for say S9 on a
machine, to maybe 15-20 over S9. Very noticable in my
case using the larson 5/8 antenna on top of a car roof.
Was like a different antenna..
MK